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| 8. | 1 8 976 ; 2 8 30 ; 3 2800 ; 4 185 . | 2 (1 2 ) | |
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| 10. | 24 035 | 2 | |
| 11. | 1) 710-290=420 2) 420 2 = 840 (710-290) 2 = 840 710 2 - 290 2 = 840 | 3 | |
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| 14. | 1) 39 2) 3) 4 4) 5 5) 53 | 5 ( 1 , ) | |
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